Absolute Time Server is a free, full-featured time server, which works as windows service and is fully RFC-868 and RFC-2030 compatible.

Read more...
Absolute Time Corrector ver. 7.7
A new version of Absolute Time Corrector has been released. This version features improved  synchronization algorithms and an enhanced interface. Additional  information about the program and a link to a free trial version can be  found on the product page.